APSA-380 Sulfur Dioxide Monitor

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The APSA-380 Sulfur Dioxide Monitor is an analyzer for measuring sulfur dioxide in ambient air and other background gases, for air quality control as well as for variety of industrial applications. HORIBA’s state-of-the-art ultraviolet fluorescence (UVF) technology enables high sensitivity and stable real-time continuous measurement.

Ultimate Performance

  • Ultraviolet fluorescence technology provides excellent sensitivity, stability and robustness
  • Real-time continuous measurement
  • Wide measurement range with up to 8 ranges selectable, minimum 0-0.05 ppm and maximum 0-20 ppm
  • UV fluorescence detector and integrated HC cutter eliminate interference from moisture and coexisting components
  • Incorporated UV lamp intensity compensator
  • Enhanced Lower Detection Limit and response time


User-Friendly Interface & Functionality

  • Durable 7-inch wide color touch screen LCD with intuitive interface and trend graph
  • Selectable metrics (ppb, μg/m3, ppm, mg/m3), response time (moving average value), and calculation method
  • Programmable dilution ratio
  • Dust filter accessible from the front panel for easy daily maintenance

Reduced Operational Expense & Maximum Uptime

  • Remote diagnostics allow fast and effective maintenance
  • Internal parts timer with alarm facilitates timely parts replacement, optimizing parts stock
  • Module design enables easy and fast replacement at field
  • High-quality, long lifetime parts for maximum uptime


 Connected & Intelligent

  • Remote operation from various devices: PC, tablet or smartphone
  • Modbus® TCP and RTU communication
  • USB flash drive for data storage

* Standard specification is wired LAN connection. For wireless connection, separate device is required.


Module Design for Various Needs & Customizations

  • Each standalone module, powered by DC 24 V, is capable of providing measurement results
  • Customizable for stationary, wall mount, mobile or portable installations
  • Easy integration of multiple AP-380 measurement modules into air quality monitoring station or dilution continuous emission monitoring station (CEMS)


Environment-Friendly Design

  • Remote operation reduces emission from transportation, contributing to the reduction of carbon footprint
  • Approx. 20%* reduction in power consumption
  • Long life parts reduce environmental load

* In-house comparison with previous model.

APSA-380 Specifications

ComponentSulfur dioxide (SO2)
Measuring principleUltraviolet Fluorescence
Measurement range0-0.05/0.1/0.2/0.5/1.0/5.0/10/20 ppm (up to 8 ranges selectable, auto-range)*1
Lower Detection Limit (2σ)< 0.3 ppb*2*3
Measurement unitppb, µg/m3, ppm, mg/m3
Sample gas flow rateApprox. 0.6 L/min
Repeatability±1.0% of full scale
Linearity±1.0% of full scale
Zero drift< 0.5 ppb (24 h)
Span drift< 0.5% of full scale (24 h)
Response time (T95)< 120 s from the inlet*3
Display7-inch color LCD with touch panel
CommunicationEthernet × 2 (Modbus® TCP), RS-232C × 1 (Modbus® RTU) , USB flash drive × 1
Analog output (option)Maximum : 3 channels (insulated)
DC4-20 mA, DC 0-0.1 V, DC 0-1 V, DC 0-5 V or DC 0-10 V
Digital output (option)Relay contact output for range 3 channels, relay contact output for other 6 channels
Digital input (option)Maximum : 4 channels, non-isolated input
Installation environmentOperation temperature : 0-40℃ (32℉ – 104℉), relative humidity : 85% or less
Temperature and pressure compensationWith
Sampling pump and filterInternal
Power supplyAC 100-240V ±10% (max. voltage: AC 250 V), 50/60 Hz, consumption 50 W
Dimensions, weight430 (W) x 568 (D) x 221 (H) mm, Approx. 18 kg
ComplianceCE, UKCA, KC, FCC, China RoHS

*1 : 2nd point calibration is required in case of using higher than 1 ppm range  *2 : For ranges less than 1 ppm  *3 : Digital filter
・ If there is other measurement range requirement than shown above, please consult HORIBA
・ Modbus is a trademark of Schneider Electric USA Inc.

Dimensional Outline (Unit: mm)


Rear Panel Configuration


1. Exhaust                                    6. I/O terminal block
2. Calibration gas inlet (option)      7. USB flash drive connector
3. Sample gas inlet                        8. Ethernet connector
4. Guide label                                9. RS-232C connector
5. AC power connector


▪ I/O terminal block (Analog input/output, digital input/output)
▪ Pressurized calibration unit  ▪ Flow sensor  ▪ USB flash drive
▪ Mounting parts (rubber feet, brackets and slide rails, brackets for slide rails)

APSA-380 brochure


Ultraviolet Fluorescence


Environmental Protection




SO2 – Sulfur dioxide


Automotive, Bio Energy, Bioprocessing, Chemical, Environmental & water treatment, Fermentations, Fertilizer, Food & Beverages, Forensics, Hospital, Laboratories, Marine, Petrochemical, Pharmaceutical & Bio Pharma, Polymers, Power Plants, Pulp & Paper, Refinery, Security, customs, fire department, drug agencies, Semi-Conductor, Steel Plants, Sterilization, Universities, Waste Water